* It's a misspelling: It might be a variation of a real word with a similar spelling. Could you provide more context or the source where you encountered it?
* It's a regional dialect word: It might be a word specific to a particular region or language.
* It's a fictional word: It might be a made-up word used in a specific book, movie, or game.
Please provide more information so I can help you determine the meaning of "maesse."